Looking to Design a Custom Card Game — Any Tips?

[printmygame]

Hey everyone,
I’m planning to customize a card game for a fun group project and possibly sell a few decks online. I found this site that offers custom game card printing: https://printmygame.com/custom-game-cards/
 and it looks like a great resource.

Has anyone here created their own card game before? I’d love to hear about your experience with designing the cards, choosing materials, and working with a printing service.